Waveguide acoustooptical units for correlation and spectrum processing of multicolor optical signals in real time

In this paper, the design and development of mathematical model and computer simulation of the waveguide acoustooptical units (WAOU) for correlation and spectrum processing of multicolour optical signal real time are discussed. The WAOU is based on the waveguide acoustooptical Bragg diffraction of the modulated light beam on a modulated surface acoustic wave (SAW) and the registration of this diffraction image. For theoretical analysis we suppose that only TE₀ waveguide mode exists for undiffracted and diffracted optical waves. The diffraction wave is considered to propagate only forward (there are no back propagated waves), the diffracted wave amplitude changes are small, total optical loss are small. These approximations permit us to solve wave equations analytically and to write the solution in an integral form